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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce09719008de6ac509cdbe35980189cf7afbfef8e94afbb1ea90e531ec20a69' 
  AND token = '7wXNH6sERAriNxEfdyN69n2ThBe6Qndr82udHiyNeCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}